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Act straight away:
Don’t go back inside until the alarm has stopped. Once the air clears, it can take up to 10 minutes for the sensor to reset and the alarm to stop. Don’t use any fuel burning appliance again until a qualified engineer has checked it. For gas appliances, the engineer must be Gas Safe registered.
Never ignore a full alarm. Four repeated beeps with a flashing red light mean potentially lethal levels of CO, so always follow the steps above first.
Other sounds mean something different:
Our guide to why your CO alarm is beeping explains each pattern in more detail. If your alarm has a display, our icon identifier guide explains what each symbol means.
Some FireAngel CO alarms warn you before carbon monoxide reaches the level that sets off the full alarm. On the FA3322, FA3328 and FA3820, one short and one long chirp every 25 seconds, with an amber flash, means the alarm has detected low levels of CO over a sustained period:
It isn’t a full alarm, but don’t ignore it. Open doors and windows and get a qualified engineer to check your fuel-burning appliances. If anyone feels unwell, or the alarm changes to four loud beeps with a red flash, follow the emergency steps above.
You can silence the early warning for 12 hours by pressing the Test button. The sounder stops but the amber light keeps flashing. If a higher CO level is detected after the 12 hours, the alarm will sound again. To end the silence early, press the Test button again.
Our FireAngel FA3322 Digital Display Carbon Monoxide alarm was awarded Which? Best Buy status in November 2024, recognising its quality and reliability.
Designed to help keep your home safe, the FA3322 features a digital display, colour-coded LED alerts and early warning alarms to alert you to potentially dangerous levels of carbon monoxide. Its portable design also makes it a practical choice for UK homes.
Choosing a reliable CO alarm is an important step in protecting your household from the dangers of carbon monoxide. Find out more about our Which? endorsement here.
Look out for:
If you or anyone else has these symptoms, get medical help straight away. Call 999 if symptoms are severe or getting worse, and tell them you may have been exposed to carbon monoxide. Our guide to the symptoms at different carbon monoxide ppm levels explains more.
If you don’t know what caused the alarm, ventilate and get everyone out first.
On the FA3313, FA3322, FA3328, FA3820 and FA6813, pressing the Test button silences a full alarm for 5 minutes. It won’t silence if the CO level is above 150ppm, it can only be silenced once, and it will sound again if the CO level stays high. You can silence a low battery chirp for 8 hours the same way. Always follow the instructions for your model. Our guide to maintaining and testing your CO alarm covers the Test button in more detail.
Only once the alarm has stopped, which can take up to 10 minutes after the air clears, and the gas emergency service has told you it’s safe. Don’t use any fuel burning appliance until a qualified engineer has checked it.
Call the National Gas Emergency Helpline on 0800 111 999 for a suspected CO leak. Call 999 if anyone is seriously unwell or has collapsed.
Headaches, dizziness, nausea and breathlessness are the most common early signs. Get everyone into fresh air and get medical help.
No. A CO alarm detects carbon monoxide, not natural gas. If you smell gas, leave the property and call 0800 111 999. Our guide to whether a carbon monoxide detector can detect gas explains the difference.
Follow the same steps: get everyone out and call 0800 111 999. Then tell your landlord or housing provider so they can arrange for the appliance to be checked and repaired.
An amber flash with one beep a minute is a low battery warning. On the FA3322, FA3328 and FA3820, an amber flash with one short and one long chirp every 25 seconds is an early warning of low level CO. Ventilate the property and get your appliances checked.
If you can't find what your looking for on our blogs and looking for further guidance and advice, our UK-based Customer Support team are on hand all week from 8:30am until 5:30pm, they can answer any further queries you may have on our products, solutions or services.
